1. Решить методом подстановки cистему уравнений
{x+5y=7,
{3x+2y=-5.

{4x-2y=-6,
{6x+y=11.
{2x-y=13,
{2x+3y=9.

{2x+5y=-7,
3x-y=15.
2. Решить методом сложения
{x-2y=8,
{x-3y=6.

{2x+3y=3,
{5x+6y=9.

{4x-6y=26,
{5x+3y=1.

{7x+3y=1,
{2x-6y=-10.
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